Installation manual

IP DECT Installation Page 98
15-601085 Issue 04f (11 June 2009)IP Office
7. Appendix
7.1 DHCP Server Operation
A third-party DHCP server can be used to provide the IP address information required by the IP DECT base stations. The
table below indicates the information that can be provided through DHCP.
Option
Usage
Notes
–
IP Address
Mandatory
The IP address is taken from the yiaddr field in the DHCP
message.
–
Netmask
Mandatory
The IP netmask is taken from the subnet mask option (code 1).
–
Gateway
Mandatory
The default gateway is taken from the router option (code 3).
–
Boot file name
Mandatory
The boot image filename is taken from the file field in the DHCP
message. If this field is empty, the default filename iprfp.bin is
used.
–
TFTP server
Mandatory
The TFTP server IP address is taken from the siaddr field in the
DHCP message.
6
Domain Name Server
Optional
This option specifies the Domain Name System Servers available
to the client in order of preference. The minimum length for this
option is 4 octets, and the length must always be a multiple of 4.
15
Domain Name
Optional
This option specifies the domain name that the client should use
when resolving hostnames via the Domain Name System. The
minimum length is 1.
42
Network Time Protocol
Server
Optional
This option specifies by IP address the NTP servers available to
the client in order of preference. The minimum length is 4 octets
and the length must always be a multiple of 4.
224
Magic String
Mandatory
The value of this option must be OpenMobility.
225
VLAN ID
Optional
Public option 225 (code 225) with a length of 2 bytes is
interpreted as VLAN ID. If this option is present the booter will
start over with releasing the current lease and issuing a new
DHCP REQUEST, now using VLAN.
226
ADMM IP Address
Mandatory
The value is interpreted as ADMM IP address; the length must be
4 bytes.
227
Syslog Server IP Address
Optional
The value is interpreted as the IP address of the syslog server,
the length must be 4 bytes.
228
Syslog Server Port
Optional
The value is interpreted as the port the syslog server is
monitoring. The length must be 2 bytes.
The DHCP client request its own IP address using code 50. The DHCP client will select the DHCP server that offers the
currently used IP address. Additionally, the mandatory options must be offered otherwise the DHCP OFFER is ignored by
the DHCP client.
The DHCP client selects the DHCP server according to the following rules:
· The public option (224) has a value equal to the string OpenMobility.
or
· The file field in the DHCP message has a sub string equal to ip_rfp.cnt.
If no matching reply is received, the DHCP client resends the request twice more after 1 second. The DHCP client will wait
for 1 minute before resending 3 requests again. If the DHCP client cannot accept a DHCP offer within 3 minutes, the IP
DECT Base Station reboots.
Each application software comes with the latest released booter software. The application software will update the booter
automatically as long as the major release number of the booter software has not changed, e.g. booter software 2.1.2
will not be automatically updated by booter SW 3.x.y, but booter software 3.0.0 will be automatically updated by booter
software 3.1.0.
The booter update of booters with major release number change, will be performed automatically when the DHCP client
in the application receives an DHCP OFFER with the public option 254 with a value UPDATE. This feature is currently not
supported by the IP Office DHCP server.